1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef ASH_SESSION_STATE_OBSERVER_H_
6 #define ASH_SESSION_STATE_OBSERVER_H_
10 #include "ash/ash_export.h"
11 #include "base/basictypes.h"
15 class ASH_EXPORT SessionStateObserver
{
17 // Called when active user has changed.
18 virtual void ActiveUserChanged(const std::string
& user_id
) {}
20 // Called when another user gets added to the existing session.
21 virtual void UserAddedToSession(const std::string
& user_id
) {}
24 virtual ~SessionStateObserver() {}
27 // A class to attach / detach an object as a session state observer with a
29 class ASH_EXPORT ScopedSessionStateObserver
{
31 explicit ScopedSessionStateObserver(ash::SessionStateObserver
* observer
);
32 virtual ~ScopedSessionStateObserver();
35 ash::SessionStateObserver
* observer_
;
37 DISALLOW_COPY_AND_ASSIGN(ScopedSessionStateObserver
);
42 #endif // ASH_SESSION_STATE_OBSERVER_H_